Object: An entity that contains or receives information. Access to an object potentially implies access to the information it contains. Examples of objects are records, fields (in a database record), blocks, pages, segments, files, directories, directory trees, process, and programs, as well as processors, video displays, keyboards, clocks, printers, and network nodes. Devices such as electrical switches, disc drives, relays, and mechanical components connected to a computer system may also be included in the category of objects [NCSC88].